WO2010025409A1 - Articulation mécanique biomimétique - Google Patents

Articulation mécanique biomimétique Download PDF

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Publication number
WO2010025409A1
WO2010025409A1 PCT/US2009/055429 US2009055429W WO2010025409A1 WO 2010025409 A1 WO2010025409 A1 WO 2010025409A1 US 2009055429 W US2009055429 W US 2009055429W WO 2010025409 A1 WO2010025409 A1 WO 2010025409A1
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WO
WIPO (PCT)
Prior art keywords
tendon
support member
pulley
actuator
mechanical joint
Prior art date
Application number
PCT/US2009/055429
Other languages
English (en)
Inventor
Stephen C. Jacobsen
Marc Olivier
Brian Maclean
Original Assignee
Raytheon Sarcos, Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Raytheon Sarcos, Llc filed Critical Raytheon Sarcos, Llc
Priority to US13/061,482 priority Critical patent/US8516918B2/en
Priority to EP09741067A priority patent/EP2337527A1/fr
Priority to CN200980142653.0A priority patent/CN102196785B/zh
Priority to JP2011525252A priority patent/JP5607629B2/ja
Publication of WO2010025409A1 publication Critical patent/WO2010025409A1/fr
Priority to IL211446A priority patent/IL211446A/en

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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • A61F5/00—Orthopaedic methods or devices for non-surgical treatment of bones or joints; Nursing devices; Anti-rape devices
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    • B25J9/10—Programme-controlled manipulators characterised by positioning means for manipulator elements
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    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
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Definitions

  • the field of the invention relates generally to exoskeletons and robots, and more specifically to the mechanical joints for exoskeletons and robots having natural or humanlike characteristics.
  • Efficiency has also suffered in powered prosthetic limbs as these devices have been primarily confined to the laboratory, research centers, or individuals living in populated areas with ready access to sources of power. In a remote work or battlefield environment, however, efficiency is critical for long-term operation and/or survivability, as an exoskeleton or human-like robot is useless if it prematurely runs out of fuel or discharges its batteries. Advancements in more efficient operation of human-like robotic devices or exoskeletons, particularly more efficient operation of the biomimetic joints through a range of movements and load conditions, without sacrificing speed or power, are greatly needed and will serve to provide improved, un-tethered human-like robotic activity.
  • the human body can be one model for optimizing the mechanical joints in exoskeletons and human-like robots for efficiency.
  • the bodies of all species in the animal kingdom, including humans, have been evolved over time for highly-efficient operation, in order to function and survive with only a last meal or stored fat for energy.
  • the ability to emulate the efficient movement of a human limb around a natural joint can be provided, at least in part, with a biomimetic mechanical joint.
  • this includes the ability to provide a biomimetic mechanical joint that emulates the variable torque provided by a natural joint, which variable torque is needed to efficiently rotate the joint through a range of positions and under a variety of load conditions.
  • the biomimetic mechanical joint can include a variable radius pulley coupled to one or more pairs of antagonistic actuators with one or more flexible tendons, to provide a variable torque when rotating a rotary support member or limb segment that emulates the variable torque provided by a corresponding natural joint.
  • the present invention resides in a biomimetic mechanical joint for emulating the variable torque provided by a natural joint, the mechanical joint comprising a base support member of a robotic device, a rotary support member of the robotic device, and a variable-radius (“VR") pulley rotably coupling the rotary member to the base member.
  • the VR pulley further comprises a sheave body with a circumferential outer surface and a pivot point, the radial distance between the outer surface and the pivot point being variable along a length of the outer surface, one or more tendon grooves formed in the outer surface, and a tendon attachment point formed within the tendon grooves.
  • the mechanical joint also includes one or more flexible tendons, each tendon coupled to the tendon attachment point and having first and second free end portions wrapping around the pulley in opposite directions within the tendon groove.
  • the mechanical joint further includes one or more antagonistic actuator pairs, each actuator pair coupled with a pair of end connectors to the two end portions of a tendon, and where the actuator pair is configured to pull the tendon around the variable-radius pulley in either direction to create a variable torque between the base and rotary support members.
  • the present invention resides in a biomimetic mechanical joint for emulating the variable torque provided by a natural joint, the mechanical joint comprising a base support member of a robotic device, a rotary support member of the robotic device, and a variable-radius (“VR") pulley rotably coupling the rotary member to the base member.
  • the VR pulley further comprises a sheave body with a circumferential outer surface and a pivot point, the radial distance between the outer surface and the pivot point being variable along a length of the outer surface, a tendon groove formed in the outer surface, and one or more tendon attachment points formed within the tendon groove.
  • the mechanical joint also includes one or more flexible tendons coupled to a tendon attachment point and having a free end portion wrapping around the pulley within the tendon groove, and one or more actuators coupled to the free end portion of the tendon and configured to pull the tendon around the variable-radius pulley to create a variable torque between the base and rotary support members.
  • the present invention also resides in a method of making a biomimetic mechanical joint for generating a variable torque between support members of a robotic device.
  • the method includes obtaining a base support member and a rotary support member, and coupling a variable-radius pulley having a pivot means between the base support member and the rotary support member to facilitate rotation of the rotary support member about the base support member.
  • the method further includes mounting one or more antagonistic actuator pairs to the rotary support member, and installing one or more flexible tendons between the variable-radius pulley and the antagonistic actuator pairs, wherein the actuator pairs activate to pull the tendon around the variable-radius pulley in either direction to create a variable torque between the base and rotary support members.
  • FIG. 1 illustrates a perspective view of an exemplary exoskeleton which can provide a platform for the biomimetic mechanical joint of the present invention
  • FIG. 2 illustrates a side view of a biomimetic mechanical joint, according to an exemplary embodiment of the present invention
  • FIG. 3 illustrates a close-up side view of a variable radius pulley, according to the embodiment of FIG. 2;
  • FIG. 4 illustrates a close-up side view of a variable-radius pulley and tendon system, according to the embodiment of FIG. 2;
  • FIG. 5 illustrates a perspective side view of a variable radius pulley having two tendon grooves
  • FIG. 5 A illustrates a side view of a variable radius pulley having two tendon grooves of differing diameters
  • FIG. 5B illustrates a side view of a variable radius pulley having two tendon grooves of differing shapes and alignment
  • FIG. 6 illustrates a perspective view of a biomimetic mechanical joint, according to another exemplary embodiment of the present invention.
  • FIG. 7 illustrates a perspective view of a biomimetic mechanical joint, according to yet another exemplary embodiment of the present invention.
  • FIGS. 1-7 Illustrated in FIGS. 1-7 are various exemplary embodiments of a biomimetic mechanical joint that can be integrated into powered prosthetic limbs, human-like robots, exoskeletons or other biomimetic robotic devices, etc.
  • the biomimetic mechanical joint of the present invention can use a variable-radius ("VR") pulley, in combination with one or more antagonistic actuators, to meet the motion requirements of the mechanical joint about a single degree-of-freedom ("DOF") axis.
  • the present invention can be distinguished from the prior art, which systems typically use a rotary DC motor actuator to generate movement about the same axis.
  • the mechanical advantage provided by a VR pulley allows for the antagonistic actuators to be reduced in size in comparison to similar actuators while providing the same torque.
  • the present invention can use one or more antagonistic actuators or pairs of antagonistic actuators to power the rotary support member around the base support member.
  • Each antagonistic actuator can comprise two uni-directional actuators arranged antagonistically (e.g. an antagonistic actuator pair) to pull on either end of a tendon that can be coupled at both ends to the antagonistic actuators and at a midsection to a tendon attachment block mounted to the VR pulley. Pulling on either end of the tendon can rotate the VR pulley with respect to the antagonistic actuator, or vice versa.
  • the antagonistic actuator can further comprise a single-acting hydraulic actuator, pneumatic actuator, linear motor, or rotary electric motor, or any other uni-directional actuator (e.g. able to generate a force only one direction).
  • the single tendon can be sub-divided into two tendons, with one end of each tendon coupled to a tendon attachment point on the VR pulley and the other end of each tendon coupled to one of the actuators in the antagonistic actuator pair.
  • the biomimetic mechanical joint can be provided with one or more uni-directional actuators coupled to one or more flexible tendons that connect to tendon attachment points on the same side of the VR pulley, so as to actuate the joint in one direction only and allow an applied load (e.g. a weight under the influence of gravity, etc.) to operate the joint in the opposite direction.
  • an applied load e.g. a weight under the influence of gravity, etc.
  • the biomimetic mechanical joint of the present invention can provide significant advantages over prior-related mechanical joints, some of which are recited here and throughout the following more detailed description.
  • the biomimetic mechanical joint can be significantly more efficient than the mechanical joints in existing prosthetic limbs, exoskeletons, human-like robots or robotic devices that use a DC motor, etc. to provide a constant torque across the entire range of positions of the joint.
  • a mechanical joint which mimics the natural movement of the human body may have a torque requirement that varies, depending on the position of the support segments relative to gravity and to each other. For instance, less torque can be required to rotate the joints in an artificial leg when walking along a level surface than when standing up from a squatting position.
  • constant torque systems sized to the maximum torque operating condition have a disadvantage in that they are oversized for the reduced torque operating condition, and are thus wasteful of energy.
  • the actuator can be more-appropriately sized to meet a number of different lower torque operating conditions. In other words, efficiency can be optimized for a specific operating condition.
  • a 'fractional' actuator can be defined as an actuator that meets less-than-100% of the maximum potential torque demanded of the mechanical joint, which is the standard design point for most actuation systems.
  • a first fractional actuator can be combined with at least one other fractional actuator so that the set of fractional actuators, operating together, meets the maximum torque requirement of the mechanical joint.
  • Single, 100% actuator systems can have a disadvantage in that all of the actuator must be activated all of the time. Unless the actuator is operating at its optimum design point, it is wasting energy.
  • the wasted energy can be embodied in the excess high-pressure hydraulic fluid that is used to move the hydraulic piston under little or no load.
  • the high-pressure fluid is often throttled by a pressure control or servo valve so that the support member moves at a slower, more desirable pace. Both the use of excess fluid and throttling are examples of wasting the potential energy contained in the pressurized hydraulic fluid.
  • a mechanical joint can overcome the inherent disadvantages of the prior art by splitting the single actuator per DOF into two or more fractional actuators per DOF.
  • using a plurality of fractional actuators creates a gear shifting scenario in which the one or more actuators can be selectively recruited to efficiently meet all the operating scenarios that may be required of the joint.
  • one or the other or both of the fractional actuators can be operating near its optimum and most efficient design point.
  • the fractional split between a two fractional antagonistic actuator system can range anywhere from 95/5 to 50/50, and can further vary among the locations of the biomimetic mechanical joints throughout the humanoid robotic body.
  • the optimum ratio will depend upon the performance boundary conditions of the mechanical joint, and will vary considerably upon the designated purpose of the robotic body (e.g. general purpose, heavy lifting, running, climbing assist, etc.) and the type and configuration of the actuators in the actuator system.
  • a biomimetic mechanical joint with two fractional antagonistic actuators configured for optimal efficiency can have a fractional split generally ranging between 80/20 and 60/40.
  • fractional antagonistic actuators creating motion about each DOF axis can better emulate the structure of the human body, which naturally uses only just enough muscle to meet the performance required of the joint or limb at any particular time.
  • energy is conserved in a human joint by selectively recruiting, or activating, only the muscles or muscle groups needed to move the attached support member in the desired manner.
  • the resulting present invention mechanical joint employing both selectively recruitable fractional actuators in combination with a VR pulley can more closely emulate both the performance and efficiency of a natural joint.
  • an exoskeleton 10 which can provide a platform for the various embodiments of the biomimetic mechanical joints of the present invention.
  • the exoskeleton has the potential to provide mechanical assistance to humans in variety of situations, including increased mobility for the handicapped, augmented physical labor, and enhanced soldiering activities.
  • the exoskeleton can include a whole-body support frame. In another embodiment it can also include a partial body frame, such as the lower body walking portion, or can even be embodied in individual limbs.
  • the biomimetic mechanical joint can be applied to any load-carrying support member on the exoskeleton, and is especially suitable for one or more joints in the legs or lower half of the body.
  • the exoskeleton 10 can include a lower body portion 12.
  • the lower body portion can include a pelvic region 14 to which are attached the two legs 20, each of which can be further comprised of a hip joint 22, a knee joint 28 and an ankle joint 34.
  • the biomimetic mechanical joint can be defined as the assembly which includes the pivot device, the attached rotary support member and the actuator sub-assembly.
  • the actuator sub-assembly can often be mounted inside the rotary support member.
  • the biomimetic mechanical hip joint 22 can therefore comprise the hip pivot device 24 and the upper leg or thigh support member 26, the knee joint 28 can comprise the knee pivot device 30 and the lower leg or calf support member 32, and the ankle joint 34 can comprise the ankle pivot device 36 and the foot support member 38.
  • Illustrated in FIG. 2 is a side view of one exemplary embodiment 100 of a biomimetic mechanical joint that could be applied to any of the load bearing joints of the exoskeleton or biomimetic robotic device.
  • the biomimetic mechanical joint 100 can have a rigid outer shell 104 surrounding the pivot device 140, or variable-radius ("VR") pulley 142, and forming the rotary support member 102 of the mechanical joint.
  • VR variable-radius
  • Antagonistic actuators in this case a single antagonistic actuator pair 120 utilizing two single-acting hydraulic actuators 122, 124 can be included in an actuator sub-assembly 110 that is driven by a hydraulic control system mounted within a control module 112 located between the antagonistic actuators.
  • a flexible tendon 130 can be coupled at both ends to hydraulic actuator pistons 126, 128 extending from the antagonistic actuator pair 120, and at a midsection to a tendon attachment block 162 mounted to the VR pulley.
  • the tendon 130 can be separated into two shorter tendons, with one end of each shorter tendon coupled to a tendon attachment point on the VR pulley and the other end to one of the actuators in the antagonistic actuator pair.
  • the antagonistic actuator 120 illustrated in FIG. 2 can comprises two single- acting linear hydraulic actuators 122, 124 coupled together around the VR pulley 142 with a flexible tendon 130
  • the antagonistic actuator driving the biomimetic mechanical joint of the present invention can further comprise single-acting pneumatic actuators, linear electric motors, rotary electric motors, or any other pair of uni-directional actuators (e.g. able to generate a force in only one direction) that are capable of being coupled about the VR pulley via a flexible tendon.
  • actuator sub-assembly 110 can be mounted to the inside of the rigid shell 104 of the rotary support member 102, while the VR pulley can be fixed relative to a base support member 106.
  • the joint's actuator sub-assembly could be mounted to the inside of the upper leg or thigh support member while the hip VR pulley was fixed relative to the pelvic region.
  • the actuator sub-assembly can be mounted to the base support member 106 (in this case the pelvic region) and the VR pulley 142 can be fixed relative to the rotary support member 102 (or the upper leg support member).
  • the base support 106 member can comprise a rigid body section of the biomimetic robotic device, such as the torso, as well as the rotary support member of an adjacent mechanical joint.
  • a close-up side view of the VR pulley 142 is shown in FIGS. 3 and 4.
  • the VR pulley can comprise a disc portion 144 and an axle portion 146, and can rotate about a pivot post 180 which fits inside a center hole 148 in the axle portion of the VR pulley.
  • a rotating interface such as a bearing or a bushing (not shown), which allows the VR pulley and the pivot post to rotate relative to each other.
  • the disc portion 144 can have an circumferential outer surface 150 into which a tendon groove 152 can be formed.
  • the tendon groove can have a landing surface 156 for contacting the tendon, and side walls 158 for preventing the tendon from sliding off the VR pulley.
  • An attachment slot 160 can be formed in the disc portion 144 which axially bisects the tendon groove 152 and provides a location for a tendon attachment block 162 to be mounted to the pulley.
  • Hollow pockets or voids 170 can also be formed in the disc portion to reduce the weight of the VR pulley, and can have structural ribs 172 of different lengths providing support for the outer landing surface.
  • the circumferential outer surface 150 of the VR pulley 142 can be round, with the center hole 148 formed in a location that is off-set or eccentric from the geometric center of the round outer surface or disc body 144.
  • the center hole 148 can further define the pivot point about which the VR pulley 142 rotates, so that the radial distance between the outer surface and the pivot point is variable along the length of the outer surface 150.
  • a round pulley with an eccentric center hole 148 and axle portion 146 can form a VR pulley, as shown.
  • the VR pulley's disc body and outer surface may not be round, but instead can be an oblong, elliptical or some other non-round body or shape that provides the VR pulley with a continuously variable radius having more or less eccentricity than the round embodiment 142 with an eccentric pivot point illustrated in FIGS. 3-4.
  • the VR pulley 142 can include a cut-out notch 164 in the disc portion 144 that is diametrically opposite the attachment slot 160 and attachment block 162. Within the cutout the sidewalls 158 of the tendon groove 152 can be removed down to the level of the landing surface 156, resulting in a notch that is substantially flush with the landing surface of the tendon groove.
  • Either end of the cut-out can have a corner radius 166, 168 that can match the round profiles of end connectors 132, 124 mounted to the ends of the actuator pistons, ⁇ see FIG. 4).
  • the corner radius of the cut-out can be configured to partially receive the end connectors when the VR pulley has been rotated to either furthest rotational position.
  • the corner radius 168 of the cut-out notch can receive the rounded end-connector 134 when the VR pulley is rotated to its furthest clockwise position.
  • the corner radius 166 of the cut-out can receive the rounded end-connector 132 when the VR pulley is rotated to its furthest counter clock- wise position.
  • Providing the VR pulley with a cut-out having corner radii can advantageously extend the range of rotation of the biomimetic mechanical joint by a few degrees in either direction, as well as avoid jerking the tendon and the actuator sub-assembly if the actuator piston reaches its furthest limits and abuts the VR pulley.
  • the first and second end portions of the tendon 130 can be attached to the tips of the actuator pistons by any means available in the art.
  • the tendon can be made sufficiently long so that the ends can be looped around or through the end connectors 132, 134 and connected back to the attachment block 162.
  • the end connectors can be configured with connector rods 136 that fit within the tendon loops and secure the tendon to the end connectors.
  • the looped configuration can be advantageous by allowing for small movements of the tendon relative to the actuator pistons during operation, as the tendon is alternately wrapped and unwrapped around the VR pulley. These movements can relieve stress and reduce wear, and further ensure that the load acting on the antagonistic actuators is in pure tension.
  • FIG. 5 Illustrated in FIG. 5 is a perspective side view of a VR pulley 242 having two tendon grooves 252, 254 formed in the circumferential outer surface 250, for application with exemplary embodiments of the biomimetic mechanical joint utilizing actuation systems with two tendons.
  • the tendon grooves can be formed to hold tendons of varying size, and where the large groove 254 can be configured to hold a tendon that is significantly wider than the small groove 252.
  • Both the attachment slot 260 and the diametrically opposed cut-out notch 264 can transversely bisect both tendon grooves.
  • the tendon grooves 252, 254 can have diameters Dl and D2, respectively, which can be substantially equal in diameter.
  • the large tendon groove 254a can have a diameter D2a which is smaller than the diameter DIa of the small groove 254a, so as to provide a different mechanical advantage for each tendon and antagonistic actuator pair.
  • the VR pulley can be formed with a small tendon groove 252b and large tendon groove 254b having non-circular or elliptical shapes that are not aligned with each other and may or may not having differing diameters DIb, D2b, respectively.
  • the differences in the sizes and/or shapes and/or orientations between the two tendon grooves can be used in combination with differences in the sizing of the antagonistic actuators or antagonistic actuator pairs, as described in more detail below, to provide additional flexibility in modifying and extending the performance characteristics of the mechanical joint. Consequently, the variable torque characteristics of the biomimetic mechanical joint can become dependent upon the direction of rotation, leading to a mechanical joint that better emulates performance and efficiency of a natural joint.
  • One exemplary embodiment 200 of the biomimetic mechanical joint which utilizes two tendons and the dual-grooved VR pulley is illustrated in FIG. 6, without the rigid outer shells of the rotary or base support members.
  • the biomimetic mechanical joint can include two antagonistic actuator pairs 220, 230.
  • each antagonistic actuator pair in the exemplary biomimetic mechanical joint 200 can have symmetric actuators, meaning that both single-acting actuators in the same pair are of similar size and configuration, allowing the actuator pair to provide symmetric movement in both directions.
  • the antagonistic actuator pairs can comprise fractional actuators of different sizes such as a large actuator pair 230 and a small actuator pair 220, which as described above, can be operated together to meet the maximum torque requirement of the mechanical joint.
  • the small actuator pair 220 can be provided with small diameter hydraulic cylinders 222, 224 that are sized for a different operating state than the actuators 232, 234 of the large actuator pair. It can be appreciated that, for a given flowrate of hydraulic fluid from a control body 212, a smaller hydraulic piston area will rotate the VR pulley faster than a larger hydraulic piston area, but with reduced force. Thus, the larger diameter actuator pair will rotate the VR pulley at a slower rate with the same flowrate of hydraulic fluid, but can provide more pulling force on the tendon since the force imparted by the actuator is directly proportional to the area of the hydraulic piston.
  • each fractional antagonistic actuator pair 220, 230 can be linked together over the VR pulley 242 with tendons 280, 290.
  • the tendons may be provided in a variety of shapes sizes
  • the tendons shown in the embodiment 200 can have a belt-shaped profile of defined width and thickness, and can further be configured with dimensions that match with the width and thickness of the corresponding tendon grooves 252, 254.
  • Each tendon can be coupled at its midsection to the attachment block 262 connected to the VR pulley, which device can fix the tendons to the VR pulley and prevent slippage of the tendons within the grooves.
  • the tendons 280, 290 can be attached to the ends of the actuator pistons 226, 236 by looping the tendons through end connectors 282, 292 and coupling the ends of the tendons back to the coupling block 262. Additionally, each end connector can be configured with a connector rod 284 that fits within the tendon loops and secure the tendons to the end connectors.
  • Other means for coupling the tendons to the fractional antagonistic actuators can be appreciated by one of skill in the art, and are considered to fall within the scope of the present invention.
  • the fractional actuators can be selectively recruited and disengaged from powering the biomimetic mechanical joint. Consequently, the two tendons 280, 290 can be separately attached to their respective antagonistic actuator pair 220, 230 with the end connectors 282, 292 to allow relative movement between the two tendons in response to varying load conditions, e.g. a loaded tendon can stretch more than an unloaded tendon. For instance, if the large actuator pair 230 is active and the small actuator pair 220 is inactive or disengaged, the segment of the larger tendon 290 attached to the working large actuator 232 can stretch slightly under load, while the segment of the smaller tendon 280 for the adjacent small actuator 222 can remain slack.
  • actuator pistons 226, 236 of both the small 224 and large inactive 234 actuators can follow the movement of their respective tendons 280, 290 as they roll up onto the VR pulley rotating under the influence of the active working actuator 232.
  • the tendons 280, 290 can be linked together at the end connectors 282, 292 such as with an extra-long, common connector rod 284.
  • the two antagonistic actuator pairs can share a common end connector coupled to a single, double- wide tendon-belt. Linking the end connectors or using a double-wide tendon belt can ensure that the inactive actuator follows the active actuator during rotation of the mechanical joint, and can be maintained in a position for ready activation at any moment in time. Combining the VR pulley 242 with selectively recruitable fractional actuators
  • a VR pulley 242 can facilitate the rotation of the rotary support member about the base support member by creating a mechanical advantage between the pivot device 240 and the actuation sub-assembly 210 during the high-torque operating conditions. This can effectively reduce and smooth out the power requirements for driving the mechanical joint 200 across its entire range of motion and under a variety of load conditions, and allow for the selection of a smaller and less-powerful (e.g. less-demanding and energy-consuming) antagonistic actuator to drive the mechanical joint and still meet required performance criteria.
  • a smaller and less-powerful (e.g. less-demanding and energy-consuming) antagonistic actuator to drive the mechanical joint and still meet required performance criteria.
  • the fractional actuators can be selectively recruited or disengaged according to the instantaneous speed and torque requirements on the mechanical joint 200, so that either the small antagonistic actuator pair 220 or the large antagonistic actuator pair 230 or both are utilized to meet the desired performance.
  • the piston ends (or other portion (e.g., midsection)) of the actuators on either side of the control body 212 can be mounted into swivel blocks 276, 278 that can rotate relative to the control module.
  • the swivel blocks can provide the actuators with the freedom to pivot around their piston ends (or e.g., midsection, upper end, etc.) to maintain correct alignment between the long axis of the actuators, the end connectors, and the tangential contact point between the tendons and the VR pulley.
  • the control module can be lengthened so that the solid ends (e.g. opposite side from the actuator piston) of the actuators can be mounted into swivel blocks, allowing the pivoting to take place at the base of the actuator sub-assembly rather than at the mid-span.
  • each individual actuator in each antagonistic actuator pair 220, 230 can be a single-acting, linear hydraulic actuator.
  • Each actuator furthermore, can be fluidicly connected to a pressure control valve (PCV) operable with a pilot valve located inside the control body 212.
  • PCV pressure control valve
  • the PCVs and pilot valves can be configured so that the inactive antagonistic actuator pair operates in accordance with a "slosh" mode, which allows the hydraulic fluid contained in the inactive antagonistic actuator pair to shunt back and forth between the two single-acting hydraulic cylinders without consuming or performing work.
  • the inactive fractional actuator can be configured for idle operation by selecting the PCVs and pilot valves for slosh mode, which can disengage the fractional actuator from the system so that it does not contribute as a drag or brake on the biomimetic mechanical joint.
  • both fractional actuators 220, 230 may also be continuously throttled, such as with a valve module (not shown), when driving the mechanical joint 200. Consequently, it is to be appreciated that a biomimetic mechanical joint having the capability for the continuous throttling and the selective recruitment and/or disengagement of a plurality of fractional actuators results in an actuation or drive system with two control degrees-of-freedom.
  • This flexibility in operating the actuator system can be advantageous over the prior art by allowing the mechanical joint to reach various operating points with one or more actuator recruitment configurations and throttle settings, from which the most efficient can be selected.
  • the biomimetic mechanical joint can be configured with a single uni-directional actuator coupled to a single flexible tendon that is connected to a tendon attachment point on the VR pulley, and which can operate to actively actuate or rotate the joint in one direction while allowing an applied load (e.g. a weight under the influence of gravity, etc.) to operate the joint in the opposite direction.
  • the uni-directional embodiment of the biomimetic mechanical joint can be useful in a variety of applications, including human-like or natural prosthetic devices that are tailored to a specific task or function.
  • the uni-directional biomimetic mechanical joint can be provided with two or more tendon/actuator pairs that are connected to the same side of the VR pulley, to allow for the same variable load and speed capabilities described in the antagonistic actuator configuration above.
  • Other variations of the uni-directional biomimetic joint which can appreciated by one of skill in the art are considered to fall within the scope of the present invention. Illustrated in FIG. 7 is another exemplary embodiment of a biomimetic mechanical joint 300 that can be similar to previous embodiments having a VR pulley 342 powered by two fractional antagonistic actuator pairs.
  • each individual actuator in both fractional actuators 320, 330 can be sized different from each of the other actuators in the actuator sub-assembly 310, in order to take further advantage of the leveraging aspects of the VR pulley and better emulate the performance of the natural joint.
  • This enhanced variability and flexibility in design can become even more apparent when combined with a VR pulley having tendon grooves of differing sizes and/or shapes/configurations, as described and illustrated in FIGS. 5 A and 5B above.
  • the small fractional antagonistic actuator pair 320 can have a large-radius actuator 322 which, when recruited, rotates the VR pulley 342 using a large- radius portion of the 352 of the VR pulley, and a small-radius actuator 324 which, when recruited, rotates the pivot device using the small-radius portion of the 354 of the VR pulley.
  • the large, fractional antagonistic actuator pair 330 can have a large-radius actuator 332 and small-radius actuator 334 operating about the large-radius portion 352 and small-radius portion 354 of the variable-radius pulley, respectively.
  • the large-radius actuators 322, 332 can be differentially sized from their related small-radius actuators 324, 334 to take advantage of the mechanical advantage provided by the VR pulley and better emulate the performance of the natural joint.
  • a natural joint may be capable of providing greater torque when moved in one direction verses the other (for instance, the quadriceps muscles can be significantly stronger than the hamstring muscles when rotating an upper leg member about the hip joint).
  • the VR pulley 342 is assembled with an actuator sub-assembly 310 having differentially sized actuator pairs 322, 324 and 332, 334, the performance characteristics of the mechanical joint can be modified and extended, and may become dependent upon the direction of rotation of the mechanical joint.

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Abstract

La présente invention concerne une articulation mécanique biomimétique permettant de générer un couple variable entre les éléments de support d'un dispositif robotique biomimétique, comprenant un élément de support de base, un élément de support rotatif couplé en rotation à l'élément de support de base, et une poulie à rayon variable couplée en fonctionnement entre l'élément de support de base et l'élément de support rotatif. La poulie à rayon variable comprend un corps de galet présentant un rayon variable et une ou plusieurs rainures de tendon formées dans la surface externe circonférentielle. L'articulation mécanique comprend en outre un ou plusieurs tendons flexibles et des paires d'actionneurs antagonistes, chaque paire d'actionneurs étant couplée à un ou plusieurs tendons et configurée pour actionner le tendon autour de la poulie à rayon variable dans l'une ou l'autre direction pour créer un couple variable entre les éléments de support de base et rotatif.
PCT/US2009/055429 2008-08-28 2009-08-28 Articulation mécanique biomimétique WO2010025409A1 (fr)

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US13/061,482 US8516918B2 (en) 2008-08-28 2009-08-28 Biomimetic mechanical joint
EP09741067A EP2337527A1 (fr) 2008-08-28 2009-08-28 Articulation mécanique biomimétique
CN200980142653.0A CN102196785B (zh) 2008-08-28 2009-08-28 仿生机械关节
JP2011525252A JP5607629B2 (ja) 2008-08-28 2009-08-28 生体模倣機械継ぎ手
IL211446A IL211446A (en) 2008-08-28 2011-02-27 Biomimetic mechanical connector

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US61/092,699 2008-08-28

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